Version: High-performance 18 V lithium-ion batteries, compatible with all 18 V machines and chargers of the CAS platform. Continuous electronic monitoring of individual cells. Display for constant monitoring of remaining capacity. Low self-discharge and long shelf life. Processor-controlled charging and discharging management. Advantage: 100% compatibility of the batteries – now also across manufacturers. All 18 V devices and battery packs from CAS partners are 100% compatible with each other. CAS stands for "Cordless Alliance System.".